Phosphor-coated light emitting diodes including tapered sidewalls, and fabrication methods therefor
First Claim
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1. A Light Emitting Diode (LED) comprising:
- a semiconductor substrate having first and second opposing faces and a sidewall therebetween that extends at an oblique angle from the second face towards the first face; and
a conformal layer comprising phosphor on the sidewall that extends at an oblique angle from the second face towards the first face.
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Abstract
A light emitting diode includes a substrate having first and second opposing faces and a sidewall between the first and second opposing faces that extends at an oblique angle from the second face towards the first face. A conformal phosphor layer is provided on the oblique sidewall. The oblique sidewall can allow more uniform phosphor coatings than conventional orthogonal sidewalls.
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Citations
53 Claims
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1. A Light Emitting Diode (LED) comprising:
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a semiconductor substrate having first and second opposing faces and a sidewall therebetween that extends at an oblique angle from the second face towards the first face; and
a conformal layer comprising phosphor on the sidewall that extends at an oblique angle from the second face towards the first face. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13, 14)
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7. A Light Emitting Diode (LED) comprising:
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a substrate having first and second opposing faces, and a sidewall therebetween that extends at an oblique angle from the second face towards the first face;
a diode region on the first face; and
a conformal layer comprising phosphor on the sidewall that extends at an oblique angle from the second face towards the first face. - View Dependent Claims (8, 10, 11, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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9. A Light Emitting Diode (LED) comprising:
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a substrate having first and second opposing faces and a sidewall therebetween that extends at an oblique angle from the second face towards the first face that also extends orthogonal to the first face from the first face towards the second face; and
a conformal layer comprising phosphor on the sidewall that extends at an oblique angle from the second face towards the first face. - View Dependent Claims (41, 42, 43, 44, 45, 46)
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15. A Light Emitting Diode (LED) comprising:
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a substrate having first and second opposing faces and a sidewall therebetween that extends at an oblique angle from the second face towards the first face;
a reflective contact on the second face; and
a conformal layer comprising phosphor on the sidewall that extends at an oblique angle from the second face towards the first face. - View Dependent Claims (16, 17, 18, 47, 48, 49, 50, 51, 52, 53)
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19. A Light Emitting Diode (LED) comprising:
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a substrate having first and second opposing faces and a planar sidewall therebetween including a first portion that extends at an obtuse angle from the second face to adjacent the first face and a second portion that extends orthogonal to the first face from the first face towards the second face;
a diode region on the first face;
a reflective contact on the second face; and
a conformal layer comprising phosphor on the first portion of the sidewall that extends at an oblique angle from the second face towards the first face. - View Dependent Claims (20, 21, 22)
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23. A method of fabricating Light Emitting Diodes (LED) comprising:
conformally coating a sidewall, which extends at an oblique angle from a second face of a semiconductor substrate towards a first face of the substrate, with a layer comprising phosphor. - View Dependent Claims (24)
Specification